Single Vehicle Multiple Event Rollover Crashes: NASS and ... · exclude rollover crashes but...

Single Vehicle Multiple Event Rollover Crashes: NASS and CIREN Analysis

University of Virginia INOVA Fairfax HospitalCIREN Center

J. Crandall, D. Bose, G. Shaw, M. Sochor,

J. Lockerby, V. Bollapragada, J. Kerrigan, K. Mutter

A. Rizzo, R. Freeth, T. Aldaghlas, C. Vo

10,000

10,500

11,000

11,500

12,000

1982 1986 1990 1994 1998 2002 2006

Number Percent

Rollover fatalitySource: NHTSA Traffic Safety Facts 2008

Fatal Rollover Crashes by 1st EventSource: NHTSA Traffic Safety Facts 2008

Collision w/ MV (front, side, rear etc.)

Collision w/ fixed obj. (pole, tree etc.)

Collision w/ non-fixed (pedestrian, cyclist)

Non-collision rollover

Others

Rollover, 35.5 %

Non-rollover, 64.5 %

Distribution of Fatal Occupants

(Passenger cars and light trucks)

Rollover Statistics• Fatality/injury statistics for planar crashes normally

exclude rollover crashes but rollover fatality/injury statistics include planar events except designated “pure” or Single Vehicle Singe Event (SVSE) Rollovers

• Numerous experimental devices are available to study “pure” rollovers – single vehicle, single event (CRIS, 208 Dolly, JRS, DRoTS,..)

Non collision rollover (single event)

UVA DRoTS

Y’’

RollAngle

X’’=X’’’

Z’’

Y’’’

Z’’’

Y’’

RollAngle

X’’=X’’’

Z’’

Y’’’

Z’’’

Besides a challenge, what are we missing by looking only at SVSE RO and not ME RO crashes ?

Rollover + planar event

Rollover Distributions (NASS CDS)

Selection criteria

Crash year 1998-2008

Only adult drivers (> 16 years)

1 ≤ quarter turns ≤ 16

Curb weight < 5,000 kg

N=12,155 (weighted 4.3 million)

4,328,547 rollover cases~80,500 Fatalities

Single Vehicle:82.0% of Cases86.0% of Fatalities

Multiple Vehicle:18.0% of Cases14.0% of Fatalities

Multiple Event:65.6% of Cases73.6% of Fatalities

Single Event:16.4% of Cases12.4% of Fatalities

Multiple Event:18.0% of Cases14.0% of Fatalities

Multiple Event Rollover Crashes(SVME, MVME)

Pure Rollover (SVSE)

Focus of the current study

Single vehicle single Event:16.4% of Cases

12.4% of Fatalities

Single vehicle multiple Event:65.6% of Cases

73.6% of Fatalities

Single vehicle rollover crashes

Cumulative Proportion of Rollover Cases in NASS (1998-2008) for Belted, Non-Ejected, Single Event Rollovers

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16Number of Quarter Turns

All CasesAll FatalitiesAll MAIS2+All MAIS2+FAll MAIS3+All MAIS3+F

Belted/non-ejected drivers

12.4% of Fatalities

All CasesAll FatalitiesAll MAIS3+FAll SVMESVME FatalitiesSVME MAIS3+F

73.6% of Fatalities

12.4% of Fatalities

All CasesAll FatalitiesAll MAIS3+FAll SVMESVME FatalitiesSVME MAIS3+F

73.6% of Fatalities

Cumulative Proportion of Rollover Cases in NASS (1998-2008) for Belted, Non-Ejected, Single Event Rollovers

All CasesAll FatalitiesAll MAIS2+All MAIS2+FAll MAIS3+All MAIS3+F

1st quarter turn: NO fatality1st roof impact: 20% of fatalities

1st quarter turn: 20% fatality1st roof impact: 45% of fatalities

offset

Previous Research• Digges and Eigen (2005, 2006, 2007) NASS Rollovers

with damage from other crash events had majority of Harm for belted front-seat occupants and rollover crashes preceded by severe impacts with fixed/non-fixed objects had 3X injury rate compared to other RO

• Ridella and Eigen (2008) CIREN descriptive injury analysis for belted occupants in SE and ME ROcrashes

• Ridella et al. (2010) NASS injury frequency and distribution of front seat passengers in SVSE and ME Rollovers

• Bose et al. (2011) Driver MAIS 3+ injuries more likely single body region in primary rollovers compared to injuries sustained in rollovers with significant planar impacts

Project Objectives• Given

– existing experimental and computational research limited to SVSE(pure) rollover crashes, and

– the high importance of SVME crashes in terms of number of crashes, injuries, and fatalities, and

– recognizing that crash analyses, testing techniques and countermeasure designmay need to consider SVME,

Project Objectives1. Identify and compare injury frequencies in

different modes of rollover and non-rollover crashes to examine injuries by event for SVME rollover crashes

2. Compare injury patterns (by body regions) in different modes of rollover and non-rollover crashes to see if they could be used as a guide to distinguish injury attribution (planar or rollover)

3. Determine the distribution and type of planar impact and the sequence of events associated with rollover crashes

4. Examine relationship between rank 1 event (vehicle damage) and rank 1 injury

Selection criteria (NASS-CDS)

Crash year 1998-2008 Curb weight < 5,000 kg

Only adult drivers (> 16 years) N= 59,215 (weighted 31.5million)

Belt restrained + non-ejected Excludes end-over-end RO

Rollover (1 ≤ quarter turns ≤ 16)

2.44m (7.7% of all crashes)

Non-Rollover (quarter turns = 0)

All frequencies are reported in weighted numbers

Primary rollover

1.42m (58% of all RO)

Roll & Front

13% of all RO

Roll & Left

6% of all RO

Roll & Right

9% of all RO

Roll & Top

2% of all RO)

Object contacted (most severe event) =overturn

RO with Sig. Planar impacts (objected contacted during severe event)

Primary rollover

1.42m (58% of all RO)

Roll & Front

13% of all RO

Roll & Left

6% of all RO

Roll & Right

9% of all RO

Roll & Top

2% of all RO)

Frontal

47% of all

7.3% of all

Side (near)

5.9% of all

Side (far)

10.2% of all

Undercarriage

<1% of all

Object contacted (most severe event) =overturn

RO with Sig. Planar impacts (objected contacted during severe event)

Non-Rollovers Planar impacts

Primary Rollovers (Object in most severe event=overturn)

Pure Rollovers (SVSE)

+Most Severe

Body-region Distribution (AIS 3+)

01020304050

Thorax

Upper Ext.

Abdomen

Lower Ext.

Percentage of all AIS 3+ injuries (%)

0 10 20 30

Thorax

Upper Ext.

Abdomen

Lower Ext.

Top 10 AIS injury codes (AIS 3+)Primary Rollovers

(Object in most severe event=overturn)

AIS InjuryInjury

freq. %

3 Subarachnoid Hemorrhage 11

3 Unilateral lung contusion 7

3 C-spine facet fx. 54 Bilateral lung contusion 33 Open/displaced radius fx. 73 C-spine lamina fx. 3

3 Open/displaced ulna fx. 53 C-spine pedicle fx. 33 Closed humerous fx. 24 Small subdural hematoma 2

Cumulative freq. 48%

Pure Rollovers (SVSE)

AIS InjuryInjury

freq. %

4 Bilateral lung contusion 53 C-spine facet fx. 83 C-spine pedicle fx. 43 Open/displaced radius fx. 3

4 Small subdural hematoma 3

32-3 rib fx. with hemo/pneumothorax **

3 C-spine lamina fx. 43 Open/displaced ulna fx. 4

Cumulative freq. 70%

** low number of raw cases

+Most Severe

Body-region Distribution (AIS 3+)Frontal (no rollover)(by rank 1 general area of damage)

Rollover with Sig. Frontal(by object contacted and general area of damage)

010203040

Thorax

Upper Ext.

Abdomen

Lower Ext.

0 10 20 30

Thorax

Upper Ext.

Abdomen

Lower Ext.

AIS InjuryInjury

freq. %

3 Femur shaft fx. 8

3 Open/displaced radius fx. 8

3 Open/displaced ulna fx. 5

3Tibia shaft fx.(Open/displaced) 5

3 Subarachnoid Hemorrhage 23 Unilateral lung contusion 5

3 Pelvis fx. (open/displaced) 34 Bilateral lung contusion 2

3Tibia condyle fx. (open/displaced) 4

3Thoracic cavity injury with hemo/pneumothorax 5

Top 10 AIS injury codes (AIS 3+)

AIS InjuryInjury

freq. %

3 C-spine facet fx. 15

3 Femur shaft fx. 13 Orbit fx. (open/displaced) 53 Unilatreal lung contusion 33 Closed humerous fx. 4

3 Open/displaced radius fx. 43 Basilar fx. without CSF leak 6

Cumulative freq. 54%Cumulative freq. 47%

Frontal (no rollover)(by rank 1 general area of damage)

Rollover with Sig. Frontal(by object contacted and general area of damage)

Sequence of events in rollover crashesRollover is the most severe

event (non-collision over turn)

First event58%

Second event30%

Third event12%

Sequence of the “rollover event” in the crash

Rollover initiation object

Turn-over/Fall

over17%

Ground81%

Curb2%

NASS CDS 1998-2008

Sequence of events in rollover crashes

Rollover is the most severeevent (non-collision over turn)

First event58%

Second event30%

Third event12%

Sequence of the “rollover event” in the crash

Another vehicle

Turn over/fall

over12%

Embankment16%

Traffic barrier3%

Ditch/Culvert1%

Ground54%

Curb6%

1.3954

1.7369 1.6952

1.9565

Roll 0 (QT1) Roll 1 (QT 2,3,4,5) Roll 2 (QT 6,7,8,9) Roll 3 (QT 10,11,12,13)

Increased odds of sustaining a MAIS 3+ injury when a Frontal(rank=1) precedes a Rollover(Baseline: all RO, Exposure: F(#1), Outcome: MAIS3+)

1 2 3 4 5 6 7 8 9 10 11 12 13

(Equivalent QT Distributions)

First event57%

Second event29%

Third event7%

Fourth event4%

Fifth event3%

Sequence of events in rollover crashes

Collision with fixed object is the most severe event in the rollover

Sequence of the “sig. planar event” in the crash

Rollover initiation objectTurn-over/Fall

over13%

Tree6%

Embankment13%

Pole5%

Traffic barrier10%Ditch

Ground37%

Fire hydrant1%

Curb1%

Other10%

Counter SVME Example: 1st Event Minor

Driver disoriented due to medical condition and departed to the right side of the road.

2007 Ford Focus

Crash Summary

Vehicle began a CCW yaw as he attempted to return to the road.

Crash Summary

He struck a low driveway berm with his right front wheel. This induced a right side leading rollover.

Crash Summary

As the vehicle began to enter into the third quarter turn, the undercarriage struck a tree.

Crash Summary

This impact caused the case vehicle to rotate 180 degrees around the tree where it separated from the tree, completed it rollover sequence and came to rest on its roof facing east.

Crash Summary

Vehicle Photographs

Left front left rear

Right front right rear

Distribution Object Contacted in Interrupted RO

Tree (dia ≤ 10cm dia)2%

Tree (dia >10cm dia)21%

Embankment3%

Non-breakway pole (dia ≤

10cm)41%

Non-breakway pole (10cm < dia

≤ 30cm)20%

Non-breakaway pole (> 30 cm

dia)2%

Traffic barrier2%

Wall1%

Ditch5%

Bridge1%

Others2%

Collision with fixed object is the most severe and last event in the rollover crash

6.5283

1.0964 1.6202

Roll 0 (QT1) Roll 1 (QT 2,3,4,5) Roll 2 (QT 6,7,8,9)

Increased odds of sustaining a MAIS 3+ injury when a planar impact (rank 1) interrupts a rollover

(Baseline: all RO, Exposure: Planar(interrupt), Outcome: MAIS3+)

Risk of Injury when a Planar Impact Ends the RO

Roll number = roof inversions(equivalent RO QT distributions)

2 3 4 5 6 7 8 9

NASS 1998-2008

Scene/Occupant• Case vehicle

– 2003 GMC Envoy• General crash type

– Non-horizontal rollover collision (Interrupted Rollover)

• Gender

– Male• Age

– 35• Seat position

– Front left (driver)• HT/WT

– 175 cm, 83 kg

Impact• CDC

– 00TPDW5

• Restraint status

– Manual Lap/Shoulder

• Airbag status

– Frontal (no deploy)

– No side airbag

• Damage images

Crash OutlineThe vehicle lost control due to icy condition, went into southbound lane rotating CCW and departed roadway to the left, down an embankment.

Crash OutlineAfter departing off the paved shoulder. Vehicle tilted to the right, and the top hood and windshield impacted a small tree, resulting in minor damage

Crash OutlineThe roof top impacted a second and third tree, resulting in significant passenger roof intrusion.

Crash OutlineLower right side contacted the ground, completing the one quarter turn rollover event, and resulting in minor right side damage. V1 came to final rest angled on the embankment with its lower right side against the ground and its top leaning on the struck trees.

Vehicle Photographs

left front left rear

right rearight front

Select Intrusions (from > 30)

Contacts

Occupant Injuries

#Contusion/hematoma =

Laceration =

Hemorrhage =

Fracture =

Abrasion =

Rank Occupant Injury(attributed to planar event)

T10-11 FRACTURE DISLOCATION WITH COMPLETE CORD TRANSECTION, NO SENSATION OR MOTOR FUNCTION UMBILICUS DOWN; FRACTURE THROUGH VERTEBRAL BODY.

CIREN RO Cases

Variable Criteria

Occupant age ≥ 16 years

Occupant role Driver

Rollover 1≤ Quarter turns ≤ 16

Restraint usage Lap and shoulder belt used

No. of events ≤ 5

CIREN query yielded 217cases

Distribution of CIREN CasesAll rollovers: 217 cases

(belted adult drivers)

Single Event48 cases

(belted adult drivers)All object class= non-collision

Object class= collision w/ fixed

objects60* cases

Multiple Event Rollovers169 cases

Object class= Non-collision

51 cases(belted adult

drivers)

Object class= collision w/ vehicle

51 cases(belted adult drivers)

Object class= collision w/ non-

fixed object3 cases

SVME MVME

60 SVME Planar Rank 1 RO Cases –Event Sequence

Rollover 1st

Rollover 2nd72%

SVME Planar Rank 1 RO Cases –Planar Impact then Rollover (43)

Frontal60%

Left Side19%

Right Side9%

Rear0%

Under-carriage

Unknown0%

SVME Planar Rank 1 RO Cases –Rollover then Planar Impact (17) +

Frontal0%

Left Side17%

Right Side6%

Top59%

Rear (back)

Under-carriage

Unknown6%

All CIREN SVME rollover cases (n=118)

Rollover event43%

Planar event57%

Most severe vehicle damage

All CIREN SVME rollover cases (n=118)

Rollover event43%

Planar event57%

Most severe vehicle damage

Rollover85%

Planar11%

Unknown4%

Attribution of rank 1 injury in primary rollover SVME cases

*attribution based on biomechanics tab when available (n=23)

CIREN Case Reviews

Rank 1 Occupant Injury

Rank 1 Vehicle Damage

30 Single Vehicle –Multiple Event Cases Reviewed in Detail

SVME (30)

Planar (21)

Planar (16)

Rollover (5)

Rollover (9)

Planar (1)

Rollover (8)

Median=3, mode=2

CIREN Case Reviews

MAIS Occupant Injury

SVME (30)

Planar (21)

Planar (16)

Rollover (5)

Rollover (9)

Planar (1)

Rollover (8)

– 1999 VW Jetta• General crash type

– Left side impact, Non-horizontal rollover collision

• Gender

– Male• Age

– 16 years• Seat position

– 183 cm, 70 kg

Crash Outline

The vehicle descended a hill, negotiating a right curve, travelled into the left lane, was about to hit the median, overcorrected to right, began a clockwise yaw and slid right.

Crash Outline

Vehicle hit the curb with rear wheel.

Crash Outline

Scenario 1: Vehicle struck a utility pole with left side driver door, rotated 180 deg CW around the pole

Crash Outline

Scenario 1: When it disengaged the pole the rear undercarriage struck the embankment.

Crash OutlineIt overturned two quarter turns and came to rest on its top.

Impact• PDOF (degree) Rank 1 Event

– 270• CDC Rank 1 Event

– 89LPAW05• Delta V Rank 1 Event

– 42 km/h• Restraint status

• Airbag status

– Frontal (no deploy)– No side airbag

Vehicle Photographs

Right rearRight front

Left front Left rear

Right Side

Occupant Injuries

Laceration =

Hemorrhage =

Fracture =

Abrasion =

Occupant Injuries

CIREN Case Reviews

MAIS Occupant Injury

SVME (30)

Planar (21)

Planar (16)

Rollover (5)

Rollover (9)

Planar (1)

Rollover (8)

Partial EjectionsIncluded

– 1999 Dodge Ram• General crash type

– Frontal and Non-horizontal rollover collision

• Gender

– Male• Age

– 35• Seat position

– 178 cm, 73 kg

planar(vehicle damage) and Rollover (injury)]

Impact• PDOF (degree)

• CDC

– 12FLEW2

• Delta V

– 35 km/h

• Restraint status

• Airbag status

– Frontal (deployed)

Crash OutlineEstimated speed 70 mphDriver lost control and vehicle veered to

left and struck the impact attenuator.

35 -35 35

Crash OutlineEstimated speed 70 mph

It began a CCW yaw , slid laterally in north-east direction and began to roll over to the right.

As the case vehicle was rolling over it contacted and mounted the guardrail, which borders the edge of the east shoulder (left side of the cargo bed)

At the same time between 2nd and 4th QT, top and the left side was touching the road surface.

Right side of the truck bed contacts the guardrail

The case vehicle rolled a total of 6, quarter turns and came to final rest on its roof and hood,

Contacts

Intrusion

Occupant Injuries

Laceration =

Hemorrhage =

Fracture =

Abrasion =#

LARGE LACERATION IN THE SKIN OVER THE RIGHT FRONTAL REGION (INBOARD)

Conclusions• Cumulative injury for SVME RO as function of QT

showed offset & slope increase relative to SVSE RO

• Overlap in injury frequency and distribution among SVSE, primary RO, planar, and planar + rollover (exceptions: c-spine primary RO and lower limb planar)

• Planar events + RO resulted in considerably more variation in RO initiation object than SVSE RO

• Frontal + RO had higher odds of MAIS 3+ injurythan other SVME RO (OR: 1 QT – 1.4, 1-3 roof inversions 1.69-1.95)

Conclusions• Planar event ending SVME RO sequence higher

odds of MAIS 3+ injury (OR: 1 QT – 6.5, 1-2 roof inversions 1.1-1.6)

• SVME RO Rank 1 Event associated with Rank 1 Injury in 75% -85% of CIREN cases examined

• Planar Event Rank 1 in 57% CIREN SVME RO cases

• SVME RO ≠ SVSE RO + Planar

• SVME RO are complex!

• We will not propose MVME RO for next year’s CIREN Research Project

“Education is the path from cocky ignorance to miserable uncertainty”

- Mark Twain

Single Vehicle Multiple Event Rollover Crashes: NASS and CIREN Analysis

University of Virginia INOVA Fairfax HospitalCIREN Center

J. Crandall, D. Bose, G. Shaw, M. Sochor,

J. Lockerby, V. Bollapragada, J. Kerrigan, K. Mutter

A. Rizzo, R. Freeth, T. Aldaghlas, C. Vo

Primary Rollovers (Object in most severe event=overturn)

+Most Severe

Body-region Distribution (AIS 3+)

0 10 20 30 40

Thorax

Upper Ext.

Abdomen

Lower Ext.

0102030

Thorax

Upper Ext.

Abdomen

Lower Ext.

AIS InjuryInjury

freq. %

3 Femur shaft fx. 8

3 Open/displaced radius fx. 8

3 Subarachnoid Hemorrhage 23 Unilateral lung contusion 5

3 Pelvis fx. (open/displaced) 34 Bilateral lung contusion 2

3Tibia condyle fx. (open/displaced) 4

3Thoracic cavity injury with hemo/pneumothorax 5

Top 10 AIS injury codes (AIS 3+)Primary Rollovers

(Object in most severe event=overturn)

AIS InjuryInjury

freq. %

3 C-spine facet fx. 54 Bilateral lung contusion 33 Open/displaced radius fx. 73 C-spine lamina fx. 3

3 Open/displaced ulna fx. 53 C-spine pedicle fx. 33 Closed humerus fx. 24 Small subdural hematoma 2

Cumulative freq. 47%Cumulative freq. 48%

CIREN Case Reviews

SVME (30)

Planar (21)

Planar (16)

Rollover (5)

Rollover (9)

Planar (1)

Rollover (8)

Median=3, mode=2

CIREN SVME Planar Injury (Rank 1)

* Includes partial ejections

CIREN Case Reviews

SVME (30)

Planar (21)

Planar (16)

Rollover (5)

Rollover (9)

Planar (1)

Rollover (8)

Median=3, mode=2

CIREN SVME Rollover Injury (Rank 1)

* Includes partial ejections

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